A) No change
B) Reduces to r / 2
C) Increases to 2r
D) Stops moving
Correct Answer: C
Solution :
\[r\propto \frac{1}{B}\] i.e. \[\frac{{{r}_{1}}}{{{r}_{2}}}=\frac{{{B}_{2}}}{{{B}_{1}}}\Rightarrow {{r}_{2}}=\frac{{{B}_{1}}}{{{B}_{1}}/2}\times r\]= 2r
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